White Paper: Surface Chemistry Improvement On 316L Stainless Steel Weld Zones With Gelled Citric Acid-Based Ultra Pass® System

The Astro Pak Corporation Technology Group performed a study to determine the efficacy of a gel-based citric acid chelant passivation agent on welds and heat affected zones. Questions regarding this type of passivation arise from data developed in experiments using commercially available citric acid solutions, which demonstrate that elevated temperatures are necessary for adequate passivation of weld areas to occur when citric acid is the primary passivation agent. Submitted by Astro Pak Corporation